Thundurus-GX is card #SM133 of 248 in SM Black Star Promos (2017), a Promo illustrated by 5ban Graphics. At about $3.72 it is the #186 most valuable card in the set. It is one of 17 Thundurus cards printed so far.
2011BW Black Star Promos
2013Plasma Freeze
2015Roaring Skies
2017SM Black Star Promos
2021Chilling Reign
2023Obsidian Flames
2025Black Bolt
2026Delta Reign

















See the full SM Black Star Promos card list
An ungraded Thundurus-GX from SM Black Star Promos sells for about $3.72. A PSA 10 is worth more, roughly $18.60 by our estimate, and a PSA 9 around $8.56.
It is a Promo.
5ban Graphics drew the art for this card.